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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a4a4d590d093b7a0491711d199256815a3873c8138cd71f1344fb73c5a2189' 
  AND token = 'EI86mcXZ2bPKUohCX84AuoYGsaEVxDNRlLShkLF4kpo=' 
  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"
    }
  }
}