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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805912d59a5f235b05149a0f8b1926495088d92f04ec27df15fb9760f0f9e58e' 
  AND token = 'zx80Fj85P2ndoS6bZWhW0ZKmt/6+uaqDT2YGVZe+BMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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