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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ce8ad07edc65ed68ba730ad9c09c7613d774e6ae1f474f3187f877e96875e5' 
  AND token = 'D2r/ekMkuP/X0IG/EW3YiBx2kDwps046o2NsIIBW65I=' 
  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"
    }
  }
}