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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde9b4ba92aeef9a76bab21f0ed76690c5eb099c6c92a8cdbe76de44deec4a46' 
  AND token = 'YwKmnHenhEGCKahLRZ6bHuen+id9hzsnjU4i36p+e4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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