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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2844af5351488e9d94f50da20f5332115477f27caf4054febfa5a8d94b38f3d' 
  AND token = 'btamkvyzEI6XfHA9EjyLJ6IFE4oryZs8ab4/ZkCJFMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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