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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd5319da4c645c1a43fea66c5fd5d822133e18710e3cbce30db28d749b60d65' 
  AND token = '7dYQaKTVD9EjaZr2TbKJH923urCHPYC0khMbaiX+R6Q=' 
  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"
    }
  }
}