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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c6756a3d8c2bc56c8cc025a2c5d437ebc46a48ef0706f7759f01d151631bcf' 
  AND token = 'FsDz4xuRemN6jskHBQTW1mycsHMN4a/gLEWBA/4JR8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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