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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452ecdfeb7548b2fc3f6df3db193e4fc7162ca1d7cfc5253a798d796798872c9' 
  AND token = 'X4q/4leSscGeWNcvFwZmFshRKPQ1X2fKXrNkOSBthgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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