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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966f103e76fc6eabceb074ac0ec2978b2f324181be64a9945189230036dbfbe4' 
  AND token = 'ouJVFZ+uJn64CPlO3Iz8HZtwpDbHt15kWi1iD8t1C9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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