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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e038a882f7901e7a8378e471a82893c1873d5c55291bd2b398661090a42aa97' 
  AND token = 'gp3rKDwnJLUvx1OD6iHFjIuJwywBEE86ryUzqQv1SNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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