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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fffcef4779e972f88f0b44880851ae5d3669ac2aac3afcc43b597e38d9076240' 
  AND token = '0BsF2nzZHAj6tyC8dvm02wWvpU+Ide8LBuvVkhIkm+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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