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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7ef43a55f6a4d150c22093739657f9c8591f22b410b258c4ded1ae2fcdeec2' 
  AND token = 'Lhi3b6+LuQeX49wzEHwXSdY2R6UmVs7ZADWpNYAOhno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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