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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd193bedac364f67199ad66706892bd4a90eea130fa4e596e0434e5af5c7e116c' 
  AND token = '8yT3oZqoYPudPZ8V92FJHrAXzbYEldKHgfHPSCTdYYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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