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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8e9778eef9dd9c3a73066081f5aedf7a166be9f4a31dd5b40b1b201c2a6f85c' 
  AND token = 'oSGKKZIc+601GXMIvOe1iPWTU9Tro7Ip41F9H5oxDoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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