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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e802fc2da0b3990ed881b9b54e9ec5cf35664bbb1bce8ecec76f2524a0e16ad5' 
  AND token = 'NR9JTaeJxmrhu7gFwrwNCXs7/HdHeOYWQt7Y4FsAT8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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