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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e96397230cdbae4dbe273594d454eeb0f5bdba33452c23bb8131c640a97f7b3' 
  AND token = '7jabq3dYRwrsNEFI9JrsFNFY0EJeaVSyWeww0jLs8WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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