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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0a1f912fc2ba136b9f76f8d450696a6c2fdec856868e7a5c1c1bc2f5499c87' 
  AND token = 'rO3Blg7ind4ia50Xn8I+r29HQtZOuIMmEZH7Y/0iKyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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