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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb0b04eb6d6dc3a00975ef1ede42a93b35ce10f27729af22e4c041797ea0892' 
  AND token = '5E7XNHPZF1DJ23et2xrFs8qWe4kz8dNswjCyU8x12G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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