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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386b899e6ad696bec0133e361bbf9a7869b75e411791f7c8393823fc2ba62ab6' 
  AND token = 'x+3/KMcb3po5UgkjiXpMxu/jQVcE0NftUfoq1Umpm3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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