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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeffd52dbf2174f4792362e909dbfbf9f4520dd49e727c56f9f1c988d8838b88' 
  AND token = 'Tb4N3RIqzSbDtwU8mg2V/kannTevrbcoWL3aF6IeY2Q=' 
  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"
    }
  }
}