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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba1b5c5731f53d0d1fcc36e0ca56dc9ee802f14549491e07f21a9b1243b0961' 
  AND token = 'BhtfOvfxBzbKfBe7I2pdhNAoAL90KH4JiuW92U362LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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