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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdafa7a65bbda6110a4337a8a929a94a233bcbeef685337014fea1f019850d86' 
  AND token = 'bx9i+mKg1/KS/JDcEQn4+h8843HEgGP7be18wV5zbU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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