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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dfed3c52f0ad1e87d3c4d8a0623a79e982d85c9384d76838ce47f4f0c1f1bbd' 
  AND token = 'nXoQCROkBsErT4w6w2QJfOMUybMiZNlYfOV4ig50ddw=' 
  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"
    }
  }
}