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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e662a29d143f6e4a2cdeebc859d39b15d9f861a1894bcd45bc090bb196345f64' 
  AND token = 'XWQQufuJCC+kOb8RR6i+jw/aYrVXbX2ZDkl7VEFl6Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}