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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd17c43c4b66987c5ed713d55e94b80420a0051a9c45fa86ecfb60838c3b2af1' 
  AND token = 'xaA9MCDw5fNShgMKOwQ8gNII7dyD5C2u+oMJTZxBcB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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