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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636ace58029e9cbb5f3d685c7f433ce8c83743924ce6debc7a0da85e4e4ddde4' 
  AND token = 'XX3Cl8cY+X9/Ok9RRL4W7TU+y4FUu3YRNzuIpctOjaQ=' 
  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"
    }
  }
}