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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8133297fe5738cd9c717cced4b0c4b46b9fb6d53fd81c63acb0a7f0160c868' 
  AND token = 'HhFkzBpEQ9vP3aGTllbXTPW8DIatjNrqoi2dr5aRQrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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