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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29706c062f7ca825d75b79edfc9a6cb72508b46311d7793aea5a4d657302a284' 
  AND token = 'Xt+yEpL04//N8jY1AkFNQFkEEPciuBKym0nuY95qj28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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