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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade30b4fcb645cb84b830f851c01ca387185d7ccb45523df3b8c3501b2efbfbc' 
  AND token = 'rKP/SARysjnkmO1EVsC1sG+2DMtWPpPx246POcNN7+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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