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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6040341f03a3e375ac836a8e112e3a9e6a94e5acf2482e3ddb5e4847431534' 
  AND token = 'EPX1jvQ31+AuaTaLfdMXIwev9NL3RAQAIKoV5ovvWLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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