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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576e1a6ec11a88d2f8e4d41ae7e84c6b0e19a91b33b837535e2ee7c9ab865ad4' 
  AND token = 'G0Pfu/S4Mu11K9oxvwCSr33j8p+4KuBQ6jaCOyaPTX4=' 
  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"
    }
  }
}