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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3676dd9e2aab9ec5e6cc894d3f0364d174a5a6c423ea3df1a72dc98494eb780' 
  AND token = 'E1bj6uB0rOYIZGMUBZpUQ4dJ5e0p6HELi/eFej5ceog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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