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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418f3f68ab23a0e8f0793a9a7850d1764d70fae2000d6895e72ddbc164ef9e2b' 
  AND token = 'aBrcwTa+qSCyGg6z+2Qv14A0UyNK2ucI12VgCOuC0uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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