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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c7cde484027437719677195740bee5847b16b9f141b2f77260ae9ffeee235e' 
  AND token = 'dH+kf+o2dq1rPMQGdVu1D+sUISuJ8XNcaDuZUMf21ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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