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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d34cf45761c0796527a7b8aa52c4912a3810a51510acd5b3b07a11080c5768b' 
  AND token = 'PS5zxGV2gQ4L7wG6Ug7Pr12ZNtkH4PHI433OXHDC7R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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