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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208c8919f565a7c42c2d1136779d28697b9843825b1c5a5810190e13c159d2fd' 
  AND token = 'Rzz7/FiEpB1msKOADzEv/N/59Nw6D1RUu41YEUd4G2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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