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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11b225ea98a89b6745f07fae4c5755507e60ea7ae079d2c631a5e3e1543dd3a' 
  AND token = 'VC+K/qL26BjoMo8GS5O7/xTArl5G4nMv1Hw6ReM+wSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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