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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a66d424e21f76aa74320ca566d128a0ece2e5ddd068aa173d797da541f05ca6e' 
  AND token = 'wl0jHaiurwEq94G+e2ctt+t6m/bmMX3R0d5OzyQCDOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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