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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929e46c1688310d7ca06f221bf6f7a8b9d4f1d1a54b105c8f032e19d9d7710de' 
  AND token = 'nNAc3WIcoDbnD07YPm3DlDm6PxfcB4obkVk4irybTYA=' 
  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"
    }
  }
}