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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86de76bc063cb93e08c01e5f6814f809f243043f1c21d6bf17efbded61077a6' 
  AND token = 'o/+rIVCw11MFbjrO4BymT+sA6xi90rhp5fsRZ0Rme1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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