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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b2d78ddd1c22690291928622066f174edb8f99dcd8ebfb0e1947a723b0acee' 
  AND token = 'G6Fo7TMFCtp5YvFFd9BhIGNPXCK68cyp2nO+v+tUer4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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