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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ddfcfe2cbb0ed4a7f2412f89abf56682430f455aaca566b04e67083030189b1' 
  AND token = 'V98H6S03EvY8J8cVq1vm1ubnyzARM4zjvDFFbSVlGH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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