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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d305e8974de6009f8c7152d5422e9198243f49466289d1c71008ebbffde5db' 
  AND token = 'yYoS+rof7nmH9ZzVEp2Gi/SibJU4Jc6xT1P35tGNIIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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